From the Readme.txt file (of the x86/32-bit version):
C. CHANGES IN DISKEEPER 2010
IntelliWrite is a ground breaking technology that prevents the majority of fragmentation from ever occurring, dramatically improving Windows system performance.
...IntelliWrite reduces the need for disk head movement and results in a reduction of system resource usage and power consumption.
F. KNOWN INCOMPATIBILITIES
1. Acronis Backup and Recovery -- To avoid any potential data loss we don’t recommend defragmenting volumes on which Acronis Backup and Recovery is enabled.
------------------------------------------------------------
=====================================
Before using Diskeeper, I checked my hard drive for errors with Chkdsk (automatically fixing file system errors, and attempted to recover bad sectors).
According to the Diskeeper Performance Report, after installig Diskeeper, the read and write access time improved 50%.
----------------------------------------------------------
Before I get to the geeky/techy stuff below, my summary is: I have used Diskeeper for years, and recommend it.
Per their website: "We are so confident that our products will improve computer speed and reliability at your home or business that we fully guarantee your purchase for 30 days. If you are not completely satisfied with your software purchase, simply contact customer service within 30 days of your purchase date for a full refund of the software purchase price."
====================================
To try to allow you to be able to compare some values, I'm sharing some of its reports of one of my computers.
Here is the analysis Job Report:
Findings and Recommendations
--------------------------------------------------------------------------
Diskeeper has completed analysis of this volume and found
7,372 low performing files and/or directories and 63,184
excess fragments.
The count of low performing fragments is 56,326.
Very heavy fragmentation detected on this volume. You
should turn on Automatic Defragmentation and allow it to
run full time for maximum performance.
The free space on this volume is moderately fragmented.
Keep Automatic Defragmentation turned on to correct this
problem.
Health
--------------------------------------------------------------------------
Critical!
The overall health of volume C: is severely affected
The overall health is at "Critical" for the following
reasons:
1. The volume is heavily fragmented. The count of low
performing fragments is 56,326.
2. The free space on this volume is moderately fragmented.
The percentage of low performing free space is 1%.
Access Time
--------------------------------------------------------------------------
Time to read fragmented files on volume C
Current read time: 8 minutes
Optimum read time: 4 minutes
46 % improvement
Time to read all files on volume C
Current read time: 33 minutes
Optimum read time: 29 minutes
12 % improvement
Statistics
--------------------------------------------------------------------------
Volume Files
Volume size = 95,143 MB
Cluster size = 4 KB
Used space = 60,801 MB
Free space = 34,342 MB
Percent free space = 36 %
Free Space Fragmentation
Percent low performing free space: = 1 %
Total free space extents: = 45,076
Largest free space extent: = 880 MB
Average free space extent size: = 780 KB
Low-Performing files percentage
% of entire volume = 12 %
% of used space = 19 %
Directory fragmentation
Total directories = 22,125
Fragmented directories = 455
Excess directory fragments = 1,559
File fragmentation
Total files = 180,973
Average file size = 358 KB
Total fragmented files = 13,750
Total excess fragments = 61,623
Average fragments per file = 1.34
Files with performance loss = 7,126
Paging file fragmentation
Paging/Swap file size = 2,047 MB
Total fragments = 1
Master File Table (MFT) fragmentation
Total MFT size = 215 MB
MFT records In Use = 204,638
Percent MFT in use = 92 %
Total MFT fragments = 2
(In the Most Fragmented Files section of the report, \System Volume Information\_restore appeared the most.)
===============================
Here is the Job Report after I defragmented:
Findings and Recommendations
--------------------------------------------------------------------------
Diskeeper has completed a defragmentation run on this
volume and there remain 1 low performing files and/or
directories and 2 excess fragments. (There were 63,196
excess fragments before the defragmentation run, and now
there are 99% fewer.)
The count of low performing fragments is 0.
Little or no fragmentation detected on this volume. You
should keep Automatic Defragmentation turned on full time
to maintain maximum performance.
Health
--------------------------------------------------------------------------
Healthy
The overall health of volume C: is minimally affected by
fragmentation due to the low level of fragmentation.
There are no volume health issues related to fragmentation.
Access Time
--------------------------------------------------------------------------
Time to read fragmented files on volume C
Current read time: 29 minutes
Optimum read time: 0 microseconds
100 % improvement
Time to read all files on volume C
Current read time: 29 minutes
Optimum read time: 0 microseconds
100 % improvement
Statistics
--------------------------------------------------------------------------
Volume Files
Volume size = 95,143 MB
Cluster size = 4 KB
Used space = 60,805 MB
Free space = 34,337 MB
Percent free space = 36 %
Defragmentation method = Max Disk Performance
Free Space Fragmentation
Percent low performing free space: = 0 %
Total free space extents: = 3,762
Largest free space extent: = 990 MB
Average free space extent size: = 9,346 KB
Low-Performing files percentage
% of entire volume = 0 %
% of used space = 0 %
Directory fragmentation
Total directories = 5,674
Fragmented directories = 0
Excess directory fragments = 0
File fragmentation
Total files = 154,555
Average file size = 420 KB
Total fragmented files = 0
Total excess fragments = 0
Average fragments per file = 1.00
Files with performance loss = 0
Paging file fragmentation
Paging/Swap file size = 2,047 MB
Total fragments = 1
Master File Table (MFT) fragmentation
Total MFT size = 215 MB
MFT records In Use = 204,831
Percent MFT in use = 92 %
Total MFT fragments = 2
Most Fragmented Files
--------------------------------------------------------------------------
Fragments File size Most fragmented files
None
